U.S. intelligence officials say there is so far no evidence of chemical weapons used in Syria, but they are conducting their own investigation as to what happened there, Barbara Starr reports. CNN has learned new details about how the CIA is trying to find answers, including information that intelligence officials are talking to rebels and defectors to learn what they know, she says.

Officials tell CNN, military analysts are also looking at reports from Syrian doctors and videos from the attacks to see if the symptoms and conditions of the patients in them match those of a potential chemical attack. They are investigating satellite imagery to identify movement of chemical weapons and intercepting cyber chatter about attacks as well, Starr reports.

“Now, officials tell us, because the U.S. has no operatives and no U.S. military personnel on the ground inside Syria, this is going to be very tough to prove," Starr says. "And it may take them some time, if ever, to figure out exactly what happened here.”

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